Plants perennial; taproot thick; caudex branched, woody, with tufts of basal leaves. Stems erect, simple, (10-)20-60 cm, softly puberulent, viscid-glandular distally. Leaves mostly basal; basal petiolate, blade oblanceolate, spatulate, 3-8 cm × 2-14 mm, not fleshy, margins shortly ciliate, apex ± acute, glabrous to puberulent on both surfaces; cauline usually in 2-4 pairs, blade narrowly oblanceolate, lanceolate to linear-lanceolate, 0.2-0.8 cm × 10-80 mm, not fleshy, puberulent on both surfaces, at least distal ones glandular. Inflorescences (1-)3-7-flowered, open, bracteate; bracts linear-lanceolate, broadened at base, 2-10 mm. Pedicels ascending, usually longer than calyx, puberulent, viscid stipitate-glandular. Flowers: calyx prominently 10-veined, campanulate, inflated, ± umbilicate, not or only slightly constricted toward base, (10-)12-16 × 7-9 mm in fruit, glandular-pubescent, strongly viscid, veins parallel, purplish, with pale commissures, not much broadened distally, commissural veins slender, forked distally and fused to those of lobes, lobes ovate to broadly triangular with lanceolate midrib, 2-3 mm, margins purple tinged, broad, membranous; corolla white, often tinged green or purple, clawed, claw equaling calyx, glabrous, broadened distally, limb deeply 2-lobed, rarely 4-lobed, 5-7 mm, lobes with 2 prominent lateral teeth, appendages 2(-4), 1.5-2 mm; stamens equaling calyx; stigmas 3(-5), exserted. Capsules included in calyx, opening by 3(-5) teeth, each tardily splitting into 2; carpophore 2-3 mm. Seeds brown, not winged, broadly reniform and often flattened, 1.5-2.5 mm, rugose to shallowly tuberculate on sides, larger tubercules on margins. 2n = 48, 96.
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